add LKD 16

tlandle · Jun 3, 2017 · 57d3286 · 57d3286
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diff --git a/README.md b/README.md
@@ -61,7 +61,8 @@ Linux Kernel Development
 12. [Chapter 12: Memory Management](./linux-kernel-development/chapter-12.md)
 13. [Chapter 13: The Virtual Filesystem](./linux-kernel-development/chapter-13.md)
 14. [Chapter 14: The Block I/O Layer](./linux-kernel-development/chapter-14.md)
-15. (-) [Chapter 15: The Process Address Space](./linux-kernel-development/chapter-15.md)
+15. [Chapter 15: The Process Address Space](./linux-kernel-development/chapter-15.md)
+16. (-) [Chapter 16: The Page Cache and Page Writeback](./linux-kernel-development/chapter-16.md)
 
 Paper Review
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diff --git a/linux-kernel-development/chapter-16.md b/linux-kernel-development/chapter-16.md
@@ -0,0 +1,9 @@
+# Chapter 16: The Page Cache and Page Writeback
+The Linux kernel implements a disk cache called the `page cache`. The goal of this cache is to minimize disk I/O by storing data in physical memory that would otherwise require disk access.
+
+Two factors comingle to make disk caches a critical component of any modern operating system:
+- disk access is several orders of magnitude slower than memory access.
+- data accessed once will, with a high likelihood, find itself accessed again in the near future. This principle is called `temporal locality`.
+
+
+## Approaches to Caching